ORLANDO, Fla. (AP) -- A gunman opened fire today in the offices of an engineering firm where he was let go more than two years ago, authorities said, killing one person and injuring five others.

Jason Rodriguez, 40, surrendered about three hours later, after officers saw him through the window of his mother’s home and asked him to come outside, Orlando Police Chief Val Demings said.

Asked by a reporter outside the police station why he did it, he replied: “Because they left me to rot.”

Demings said Rodriguez brought a handgun to the firm in a downtown office tower where he once worked as an engineer, but investigators are not sure what his motive was.